Initial theme apply? about gestalt

[regexident]

The README mentions it:

// In `AppDelegate.application(_:didFinishLaunchingWithOptions:)`
// assign a default theme (or user's choice from user defaults):
ThemeManager.default.theme = Theme.light

But you're right, it could —and should— be much clearer! 🙈

I just pushed the first beta for v2.0.0 a couple of days ago and haven't gotten to improving the README yet. I'll make sure to improve the README!

If you have any further questions or things that might be made clearer, lemme know and I'll make sure to include them in the documentation improvements.

[regexident]

self.observe(theme: \MyTheme.view) will ensure that self.apply(theme: \MyTheme.view) is executed immediately (if a theme has been chosen at that point).

To choose a theme you assign a value to ThemeManager.default.theme early during your app's launch (e.g. in AppDelegate's func application(_:didFinishLaunchingWithOptions:)):

(Gestalt includes a GestaltDemo target which should give you an idea of how Gestalt works.)

👉🏻 GestaltDemo/AppDelegate.swift

With v2.x all you should have to do is run self.observe(theme: \MyTheme.view) once in an object's lifetime. The ThemeManager then makes sure that self.apply(theme: \MyTheme.view) is executed on every theme-observing object once its theme is changed.

[mario-deluna]

The GestaltDemo is really helpful thanks, I think what god me confused is this part in the Readme:

class ViewController: UIViewController {
    @IBOutlet var label: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()
	self.observe(theme: \Theme.view)
    }
}

This way apply is not being called initially, if the view controller is being loaded after a the theme has been set.